Improvement in piano-looks



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IMPROVEMENT IN PIANO-LOCKS.

@the rliehule referat to in this ittmi @anni `mit making pmt nf tlgrsamr.

TO ALL WI-IOM 1T MAY CONCERN:

Be it known that I, ADAM HnLMsTAnnTx-zn, of No. 25 Railroad avenue, Newark, in the county lof Essex, in the State of New Jersey, have invented a new and useful Improvement in Locksg' end I do hereby declare that the following is a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing, forming part of this specification, in whichi V Figure 1 is a sectional view of a lock made according to my invention, the tumbler and one of the side plates boing removed.

Figure 2 is a. like view, with the addition of the tumbler and its spring.

Figure 3 is a view of the face of the lock. A

This invention relates to that class of locks, whose bolts hook over or around the staple or keeper.

It consists in a peculiar construction and arrangement of hooked bolts, which are `operated by the key of the look, in conjunction with a tumbler and spring.. A

The letter c designates that part of the frame of the lock to which the bolts are connected. The letter Z designates the face-plate, through la slot in which the bolts emerge when they are driven or forced outwards into connection with the keeper of the lock. The bolts-arc two in number, e c', the latter being operated through its connection with the former by means of a pin, a, which projects from the inner face of the body of said bolt c, and works in a curved slot formed in the body of bolt c', as is shown inlg. 1. Both bolts have hooks on one of their edges, but said hooks are arranged in reverse order,the arrangement being such that each hook points in the direction which its bolt takes when it swings outwards on its pivot. The bolt c is set on a pin, 6, of a frameplate, lc, of the lock, 'on which pin it vibrates or swings. The'lower edge of this bolt c is elongated, as shown in figs. 1 and 2, to form a limb, m, whose forward edge .has a. cavity, d, against or in which the tongue of the key works, in order to swing or vibrate the bolt outwards or inwards. The rear edge of the limb mhas an upper shoulder, 1t, and a lower shoulder, o, which are engagedV by the pin j of the tumbler at the times when Abolt c is in its higher or lower position respectively, the pin 7' at those times serving to lock the bolt and prevent it from being moved until the tumbler is pushed backwards and its pin disengaged. The'bolt c has no bottom elongation like the part m of the other bolt, and it is operated through its connection with the pin a of bolt c,

as above explained. Said bolt c is pivoted on a pin, b', fixed like pin 6 in plate c of the frame. The tumbler e is hung to plate 7c by means of a pin, g, and is pressed forwards by a springtf, whose free end acts against a stop, k, a stop, z', being provided to limit the forward movement ofthe tumbler.

VFrom the construction and arrangement above shown', it will vbe observed that when the bolts c c are operi ated, they swing or vibrate on their respective pivots or centres of motion, I: b, and, furthermore, that, when they have been forced out of the lock, their upper parts which emerge from the lock swing away from each other into any keeper or staple provided for that purpose, and form in effect a. dove-taled joint therewith. When the bolts are drawn down, their outer faces come in line with each other and with the face-plate'.

What I claim as new, and desire to secure by L'ettersPatent, is-

The pin a, secured in the oscillating hook C, and catching in u slot in the hook C, substantially as and for the purpose described.

ADAM AHnLMsrarznirlin.

Witnesses:

W. Haunt', Gusmv Bene. 

